Improvement in processes and apparatus for making lamp-black



V J. ROGERS. v BROCESS APPARATUS FOR MAKING LAMP-BLACK. Ale/186,498.

Patented Jan. 23, 1877.

N-PETERS, PHOTOVLITHOGRAPNER, WASHlNGTDN. D. C.

UN T STATES" PAT NT OFFICE JOHNROG'ERS, or BROOKLYN, New YORK.

IMPROVEMENT IN PRGCESSES AND APPARATUS FOR MAKING LAMP-BLACK.

Specification forming part of Letters Patent No. 186,498, dated January 23, 1877; application filed May 19, 1876.

spending parts in all the figures.

This invention has for its object to improve the quality of lamp-black produced in a furnace by an open flame.

Experience has proved that very fine qualities of lampblack are produced by causing the flame to impinge on a plate which is placed over it; but for producing larger quantities of the material an apparatus provided with impingingplates would be too expensive.

In order to produce an effect approximating that of the impinging-plate I cause the flame of the lamp-black furnace to strike a horizontal current of coolerair; and l further improve the quality of the black by causing a current of fresh air to combine with the flame in a shaft placed near to the furnace, and through which the products of combustion are directed.

In the drawing, the letter A represents a lamp-black furnace, built of brick, metal, or other material, of suitable size and form. B is the pan or receptacle containingthe material to be burned, said pan being supported in suitable manner Within the furnace.

The furnace A is provided with a suitable I opening beneath thepan B, for admitting the oxygen necessary for the combustion of the matter contained on the pan.

O is a shaft or chamber, placed near'the furnace, and communicating with the upper part thereof by a pipe, a. By. another .pipe, 11, this shaft communicates with the lampblack-deposit chambers, and, finally, with the chimney. Y

The lower part of the shaft 0 has one or more apertures, 01, for the admission of fresh air. These apertures may have suitable doors or gates 6, so that their sizes may be regulated. V

The walls of the furnace A are perforated, as at. f f, on a level, nearly, with the pipe at, and at a considerable distance above the pan B. These apertures f f communicate, either directly or by suitable conduits g g, with the outer atmosphere, to admit the same into the furnace.

In operation, the flame being lighted on the pan B,'the products of combustion containing the lamp-black will ascend in the furnace until they arrive on a level with the pipe a. They will then sweep through this short pipe into the chamber 0, and thence into the pipe b, whence they pass off into the final depositories and chimney.

As the flame reaches the level of the pipe at within the furnace, it strikes the current of fresh air, which passes through the apertures f into the pipe at. In fact, these currents of air constitute, so to say, an, upper continually-moving stratum of cooler air, against which the flame impinges, and which, moreover, keeps the upper part of thefurnace much cooler than otherwise it would be- I find'that the lamp-black is greatly improved in fineness of grade by subjecting it in the furnace to' the aforementioned upper current or stratum of air.

The products of combustion containing the lamp-black will, as they pass through the shaft 0, draw or suck a powerful current of fresh air through the aperture d into said shaft, which air, by combining with and supplying the heated gases with fresh oxygen, causes such a moderate additional combustionto take place that the fineness of the lamp- 'black is thereby still more increased.

I claim as my invention 1. The process of treating lamp black, which consists in conducting the products of combustion directly from the furnace into a chamber, and in combining them within said chamber with a current offresh air to cause additional combustion, substantially as specilied.

2. The lamp-black furnace, combined with the shaft 0, which has the air-opening d, as andfor the purpose herein shown and desubstantially as herein shown and described. scribed.

3. A lamp-black furnace made with an air-opening beneath the place of combustion, JOHN ROGERS and with a horizontal air-opening, f, above Witnesses: the place of combustion, and on a ,level with ERNEST C. WEBB,

the horizontal discharge-pipe a; substantially O. A. WEIDNER. 

